Brake adjusting device



July 30, 1935. L. R. WILLIAMSON BRAKE ADJUSTING DEVICE Filed Sept. 30, 1932 INVETOR' LARK/IV R. WILL/AMSOM ATTORNEY Patented July 30, 1935 I My inventionrelatesto 2,609. 8: A U N ew "will!" B. Williamson,

PATENTJOFFICE,

Cincinnati, om,

to Cornelius J. Hauck, Cincinnati,-hio,

Application brakes and in particuiar to self-adjusting meansfor brakeskfij It is ,my object to provide means for auto? matically adjusting the rake drum in exactproportion to the amount of wear that the next'actuation; of

position of the brake shoe after each braking operation so h brake be u n the same relative position and bring' about the same relative; braking action that the first brakf ing action brought about. i

In the present state of the art, after the bralr ing surfaces wear an appreciable period, it is then necessary to readjust the brakes; according to my inventionthis adjustment takes place automatically by a resetting of the position of the brake shoe or the brake disc surface, or 'both, between each braking operation without the necessity of any mechanical of the operator.

adjustment on the part Referring to the draw1ng, l igure 1 is a front elevation of a portion of the brake shoe showing the brake drum in section.

Figure 2 is an end drum and brake elevation with the brake shoe partially broken away.

Figure 3 is a section through the brake drum showing the inside of the self-adjusting m Figure 4 is an brake shoe with the echanism attached. alternate view similar to Figure Y 3 showing the use of an actuating cylinder in 30 place of the cam actuator shown in Figures 1 and 3.

Figure 5 is a with the cover mechanism.

Referring to the drawing housing mounted on the axle brake drum surface or is engaged by the brake shoe 5. This liner may the brake drum it is the wearing the adjustment brake drum surface.

of the surface of an adjustment. braking position the hydraulic piston ating mechanism forms detail view partially in section removed of the self-adjusting This actuation is resisted by the spring I, which serves to return sition.

the brake shoe to its initial po- The brake shoe 5 is provided with an aperture 9 which is larger than hereinafter described. This to the normal cl the pin it for the purpose clearance is equal earance between the brake shoe september so, 1932; Serial N6; 035.594 3 Claims. (0!. lac-'19s) and brake drum in inoperative position. which normalv clearance. it is desired to. mam as a standard normal clearance. The pm I I normale iyienzaaes me outerwall oftheholeil a's'at 1n. S r keha was he Wmafinef n i brakefadjusting mechanism is" the subject of this invehtionfcompris'es a, plate I; having adiagonally 'dispos edfslot .l which is arranged at an angleof 5! to the that'i's, l0 .theline BB is arrangedatian angle or site the line AA. This cam slot ll contains a cam locking roller ll impelled into working position by the spring ll andengaging on one side the wall ll of the slot l4 and on the other side the wall ll of a ll stop member l9. This stop member is guided in the slot formed in the lower casing l3 beneath v the upper casing 2!. These casings are connected together by bolts or rivets 22. These casings are mounted upon the brake housing I by U' the retaining members 23. 1 The stop member II is provided with a slot il in which projects a pin carried by the casing members II and II and to engage the member I! in one end of the slot 24. Betweenthis pin 25 and the other end of the slot as 24 is a helical spring 2! tending to keep the stop member I! in its outermost position with its pin III that it carries against the surface ii of the aperture 9. I

As the brake shoe is applied to the brake drum, to the pin it will be caused to follow the brake shoe I and after each reciprocation, maintain its position in engagement with the surface II in the hole 9.

In the event of any wear between the brake :6 shoe, its lining and the brake drum, the brake shoe will be automatically set up to predetermine the amount of wear by the engagement of the clutch roller I5 between the surface I! and surface ll. According to this operation, each new 40 actuation of the brake shoe is from a point clour to the brake drum than the exact amount of the wear caused on the brake shoe, its lining and the. brake drum by the previous operation, as by that amount the shoe has been allowed to take a new position with respect to the brake drum. The 1 pin HI prevents the return through the stop member i9 and the clutch roller ll ens es the sur-' faces I] and ll of the brake shoe to its inflial position and only permitsit to return to a position nearer to the brake shoe in the amount of wear that has taken place during the preceding braking operation. I

My invention, therefore, consists in a braking surface and the brake sh with one half of the '58 clutch member carried by the brake housing and the other half by'the brake shoe, the clutch being so arranged that the brake shoe will return to a new position as much removed from the old initial position as the amount oi wearthathas' taken place.

. It will be understood that I desire to comprehend within my invention such modifications as may be necessarytoadapt it to varying conditions and uses.

It will be understood that my ioim or clutch means may be employed in addition to a roller,

such as a wedge or any other equivalent mechanism. I do not desire to be confined to mechanical details, as varying'types of brake mechanisms on different types of vehicles, and machines will require different types 0! mechanical forms to carry out my invention. By I mean any braking surface. Having thus fully described my invention, what i major slot, a brake shoe limiting pin on said stop member, a clutch rollerin said diagonal slot engaging one wallthereoi and one wail of the stop member, saidjbrake shoe having an aperture of larger size than said limiting pin for receiving the limiting pin on stop member, a guide pin insaid housing arranged in a slot in said stop member, and yielding means between said stop member and said guide pin, and yielding means for iorcing said clutch roller into clutch engaging position. V

2. A new article for use as a brake adiu' ng mechanism comprising a housing having a bun slotand a diagonal slot arranged at an angle of 5 degrees with respect to said main slot, a stop member in said main slot adapted to be moved by a brake shoe, yielding means for resisting said movement of the stop member in the slot, a clutch means engaging said stop member located ing said clutch means into clutching position.

3; 'A new article for use as a brake adjusting [mechanism comprising a housing having a main slot and a diagonal slot arranged at an angle oi 5 degrees with respect to said main slot, a stop member in said main slot adapted to be moved by 'a brake shoe, yielding means for resisting said movement of the stop member in the slot, a clutch means engaging said stop member located in said diagonal slot and yielding means formoving said clutch means into clutching position, said stop member having 'a loose connecting means with said brake'shoe to cause the movement 0! the stop memberwith the brake shoe when excessive'movement oi the brake shoe takes place in said diagonal slot and yielding means for movdue to wear, -said-clutch means permitting free a forward movement of said stop member.

R. WILLIAMSON. 

